Improvement in dental flasks



I UNITED STATES PATENT OFFIoE.

WILLIAM E. BUOKMAN, OF EASTON, PENNSYLVANIA.

IMPROVEMENT IN DENTAL FLASKS.

Specification forming part of Letters Patent 0. 180,193, dated July 25, 1876; application filed May 27, 1876.

To all whom it may concern Be it known that I, WILLIAM E. BUOKMAN, of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Dental Flasks, of which the following is a specification: I

Figure 1 is a top view of my improved flask, part being broken away to show the construction. Fig. 2 is a side elevation of the same, part being broken away to show the construction. Fig. 3 is a detail section of the same, taken through the line w .70, Fig. l.

Similar letters of reference indicate correspondin g parts.

The object of this invention is to furnish an improved dental flask which shall be so constructed that it may be readily emptied of the plaster without danger of breaking the teeth.

The invention consists in a dental flask formed of the two pairs of half-rings, provided with the lugs, the pins, and the top and bottom plates, provided with the flanged lugs, constructed and combined with each other as hereinafter fully described.

The body of the flask is formed of two pairs of half-rings, A. Upon the upper part of one end of each half-ring A, and upon the lower part of the other end of said ring, is formed a lug, a, of a thickness equal to halt the height of said half-ring. The lugs to project so that they may overlap each other, and their shoulders may overlap the end of the other half-- ring, as shown in Fig. 1, bringing the center of the lug in line with the joint between the ends of the half-rings. Through the center of the lugs to is formed a hole to receive the pins 13. The pins B may be made short, so as not to enter the upper lugs of the upper halfrings. 0 are the top andbottom plates, which are made with lugs 0 wider than the lugs to. of the half-rings A, and with flanges 0 upon their side edges, which pass down upon the opposite sides of the said lugs a, to lock them in place.

With this construction, after the molding or hardening of the celluloid or other material has been completed, the few tops required to sep arate the parts of the flask cracks the plaster in such a way that it falls away from the teeth without danger of breaking them, so that the plaster and teeth are readily removed from the flask and separated from each other.

If the flask is tapped slightly at the heel the plaster is cracked and the teeth easily removed. If, after removal, a quarter-section is put back on plaster, it cannot be forced off again at the heel, but if tapped in front will come'off easily without breaking the cast of mouth. The sides may be readily removed, but the article remains embedded in the mold as firmly as ever.

The two halves of flask are first separated in the center, leaving the teeth in one half and thecast of the mouth in the other. The lids are then removed, and the half containing the teeth tapped at the heel. The half containing the cast of mouth may then'be removed as a whole or in pieces. My flask, having no hinges to get out of order or look to lose, can be used in any kind of an open heater.

or over a flame.

Having thus described my invention, I claim as new and desire to secure by Letters Patent A dental flask consisting of four half-rin gs, A, having shouldered and projecting lugs a, the pins B, and the plates 0, having lugs c and flanges 0 all substantially as and for the purpose specified.

WILLIAM E. BUOKMAN.

Witnesses;

'1. MOKEEN ANDREWS, F. SIEGERT. 

